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NuSTAR can make a transformational advance in our understanding of how luminous accreting black holes work through long observations of rapidly-variable comma X-ray-bright AGN. This enables X-ray reverberation studies comma already a commonplace feature of AGN comma to proceed to the next level and follow the behavior of the powerful dynamic corona and map the accretion flow immediately next to the black hole comma measuring both spin and mass of the black hole. We propose a 500ks NuSTAR observation of the X-ray brightest high variability NLS1 AGN 1H1934-063 comma with 260ks of XMM comma to measure relativistic reflection and reverberation in 3 flux states.